⚡ Electrical Engineering Calculators
15 calculators available
Electrical engineering calculators simplify common power system design tasks. Whether you need to apply Ohm's Law to determine circuit parameters, calculate power factor for motor loads, check voltage drop compliance per NEC requirements, select proper wire sizes based on ampacity tables, or determine transformer turns ratios, our tools provide accurate results with both Metric and Imperial unit support.
Available Calculators
AWG Wire Size Converter
The AWG Wire Size Converter turns an American Wire Gauge number into conductor diameter, cross-sectional area, resistance per kilometre and voltage drop.
Battery Bank Sizing Calculator
The Battery Bank Sizing Calculator determines the storage capacity needed for a given daily load and autonomy period, allowing for depth of discharge and efficiency.
Power Factor Correction Calculator
The Power Factor Correction Calculator sizes the capacitor bank needed to raise power factor from its present value to a target, in kVAr and microfarads.
Conduit Fill Calculator
The Conduit Fill Calculator determines the percentage of a conduit's cross-section occupied by conductors, and the maximum number that may be installed.
LED Resistor Calculator
The LED Resistor Calculator determines the series resistor for one or more LEDs, snapping to the nearest E12 preferred value and reporting the resulting current.
Motor Full Load Amps Calculator
The Motor Full Load Amps Calculator determines the running current of a three-phase or single-phase motor from its shaft power, with starting current and breaker size.
Ohm's Law Calculator
The Ohm's Law Calculator solves for whichever of voltage, current or resistance is unknown, given the other two, and returns the power dissipated in the circuit.
Power Factor Calculator
The Power Factor Calculator determines the power factor from a phase angle and resolves the apparent power into its real and reactive components for a single-phase circuit.
Resistor Colour Code Calculator
The Resistor Colour Code Calculator decodes four colour bands into a resistance value with tolerance limits, and checks the result against the E24 preferred series.
Short Circuit Current Calculator
The Short Circuit Current Calculator determines the prospective fault current at a transformer's terminals and at a point downstream, from the transformer impedance and cable run.
Solar Panel Output Calculator
The Solar Panel Output Calculator estimates the daily and annual energy from a photovoltaic array, with specific yield and the aperture area required.
Transformer Calculator
The Transformer Calculator determines the turns ratio, primary and secondary currents and output power of a single-phase transformer from its voltages, kVA rating and efficiency.
Voltage Divider Calculator
The Voltage Divider Calculator determines the output of a resistive divider both unloaded and with a load, and reports the loading error the load introduces.
Voltage Drop Calculator
The Voltage Drop Calculator determines the volt drop along a single-phase circuit from the load current, one-way cable length and conductor resistance, with the percentage drop and power loss.
Wire Size Calculator
The Wire Size Calculator estimates the conductor cross-section required by current density and by a 3% voltage drop limit, then recommends the next standard size above whichever governs.
Related Categories
About Electrical Engineering
Calculate voltage, current and resistance with Ohm's law, power factor correction, voltage drop in conductors, wire sizing per NEC, and transformer ratios.
Frequently Asked Questions
What is Ohm's Law?
Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R): V = I × R. It is the fundamental relationship in electrical circuits and can be rearranged to solve for any of the three variables.
What is power factor?
Power factor (PF) is the ratio of real power (W) to apparent power (VA) in an AC circuit: PF = P/S. It ranges from 0 to 1, where 1 indicates all power is doing useful work. Low power factor means wasted energy and higher utility costs.
How do you calculate voltage drop in a wire?
Voltage drop is calculated as Vd = 2 × I × R × L / 1000 for single-phase circuits, where I is current (A), R is wire resistance (Ω/km), and L is one-way wire length (m). NEC recommends keeping voltage drop below 3% for branch circuits and 5% total.